Sitagliptin phosphate (MK431; Januvia), the phosphate salt of Sitagliptin, is an antihyperglycemic
agent (sugar-lowering) and antidiabetic medication that act as a potent inhibitor of DPP-IV (dipeptidyl peptidase-4)
with IC50 of 19 nM in Caco-2 cell extracts.